Reland [telemetry] Timeline model cleanups

tools/telemetry/telemetry/core/timeline/slice_unittest.py

Index: tools/telemetry/telemetry/core/timeline/slice_unittest.py
diff --git a/tools/telemetry/telemetry/core/timeline/slice_unittest.py b/tools/telemetry/telemetry/core/timeline/slice_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..0e38d4a96a3d26166a93901d477540aacb824141
--- /dev/null
+++ b/tools/telemetry/telemetry/core/timeline/slice_unittest.py
@@ -0,0 +1,26 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import unittest
+
+from telemetry.core.timeline.slice import Slice
+
+class SliceTest(unittest.TestCase):
+  def testChildrenLogic(self):
+    # [      top          ]
+    #   [ a  ]    [  b  ]
+    #    [x]
+    top = Slice(None, 'cat', 'top', 0, duration=10)
+    a = Slice(None, 'cat', 'a', 1, duration=2)
+    x = Slice(None, 'cat', 'x', 1.5, duration=0.25)
+    b = Slice(None, 'cat', 'b', 5, duration=2)
+    top.sub_slices.extend([a, b])
+    a.sub_slices.append(x)
+
+    all_children = list(top.IterEventsInThisContainerRecrusively())
+    self.assertEquals([a, x, b], all_children)
+
+    self.assertEquals(x.self_time, 0.25)
+    self.assertEquals(a.self_time, 1.75) # 2 - 0.25
+    self.assertEquals(top.self_time, 6) # 10 - 2 -2